642662506166 has 16 divisors (see below), whose sum is σ = 995743853568. Its totient is φ = 310761503400.

The previous prime is 642662506147. The next prime is 642662506201. The reversal of 642662506166 is 661605266246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3308570 + ... + 3497421.

It is an arithmetic number, because the mean of its divisors is an integer number (62233990848).

Almost surely, 2^642662506166 is an apocalyptic number.

642662506166 is a deficient number, since it is larger than the sum of its proper divisors (353081347402).

642662506166 is a wasteful number, since it uses less digits than its factorization.

642662506166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6807547.

The product of its (nonzero) digits is 3732480, while the sum is 50.

The spelling of 642662506166 in words is "six hundred forty-two billion, six hundred sixty-two million, five hundred six thousand, one hundred sixty-six".